win: winmain, manifest, icon, and some improvements

libs/file_to_base64.cpp

@@ -0,0 +1,20 @@
+#include "base64.h"
+#include <iostream>
+#include <fstream>
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        std::cerr << "Requires name of the file" << std::endl;
+        return 1;
+    }
+
+    std::ifstream input(argv[1], std::ios::in|std::ios::binary);
+    if (!input) {
+        std::cerr << "Failed to open:" << argv[1] << std::endl;
+    }
+    auto in_iter = std::istream_iterator<char>(input);
+    auto in_end = std::istream_iterator<char>();
+    auto out_iter = std::ostream_iterator<char>(std::cout);
+    base64.encode(in_iter, in_end, out_iter);
+    return 0;
+}